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'81 XR500R motor not an '81?

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Hi, my bike is an '81.

When I bought it it came with 2 motors.

The one in the frame (PE01-5XXXXXX) and another one in a crate (PD01E-5XXXXXX) all in pieces.

The PO told me the one in the crate was the original, he had run it out of oil.

The motor that is in the frame has smaller valve springs and smaller valve guide seals.

It also has a different cam chain tensioner that doesn't have that long metal piece sticking out past the head.

What year might that engine be?


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